Fixed colors in Chrome menu.

Fixed colors in Chrome menu. This fixes #35, resolves #40 and closes #53.

Screenshot **before** applying fix:
![iris_before_bug_fixes](https://cloud.githubusercontent.com/assets/4950658/2751643/048a636c-c8df-11e3-82eb-b9213add4928.png)

Screenshot **after** applying fix:
![iris_after_bug_fixes](https://cloud.githubusercontent.com/assets/4950658/2751645/1ffb11c8-c8df-11e3-9449-6279ab9fdf70.png)